We have been monitoring my daughter's weight gain for 8 weeks now and the nurses are not sure she is gaining enough. She gained 80g per week, twice in a row but has only gained 70g in the past 2 and a bit weeks. She will be 6 months old this week and started on the 15th percentile but is slowly moving away from this curve. She breastfeeds 7 time per 24 hours and has solids 4 times per day. She was born 3.08kg and is now 5.89kg. she is otherwise happy and meeting all her milestones, although she has recently started spitting up after breastfeeds and waking 6-7 times per night (previously only waking 1-2 for many months). should i be worried about her weight and what could be causing this?